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Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Mt Helena, WA
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May
Average Temperature
High
20°
Feels 20
Low
11°
Feels 10
Average Precipitation
7 Days
Rain amount
53.4mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
16°
3
18°
4
19°
5
21°
6
19°
7
19°
8
19°
9
20°
10
21°
11
22°
12
24°
13
24°
14
22°
15
16°
16
16°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Forecast
Saturday, May 2, 2026
Day
16°
Feels 16
Wind
16 km/h S
Gust
24 km/h
Humidity
48%
P.O.P
20%
Night
7°
Feels 6
Wind
9 km/h SE
Gust
13 km/h
Humidity
96%
P.O.P
20%
Historical Averages
May 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.